voltage on input at nite

[mahendra]

hi again but i noticed my classic showing an input voltage of 4v at night is this normal ?

[TomW]

Absolutely normal. Mine shows between 8 to 12 or so I think due to leakage through the FETS?

Tom

[boB]

That input voltage is actually there in purpose.  It was the same with the MX60.

That appears there because there is a 10K resistor across the relay contact.

The voltage that appears will always be less than battery voltage but if your PV array is
leaky or just very large, the input voltage can go down to almost zero.  I find it is
normally slightly higher than 1/2 the battery voltage if the input isn't loaded down
much by leaky modules or a large array or something.

boB

[TomW]

I stand corrected.

Not sure where I got the leakage through FETs idea? 

Tom

[boB]

I stand corrected.

Not sure where I got the leakage through FETs idea? 

Tom

Don't know, BUT, it DOES pass through the diodes of the FETs so you're not very far off.

boB

[mahendra]

thanks guys i am very keen on keeping my system safe for many reason , as for warranty i dont know if i would still be eligible because i am located way over in south america and even if i am eligible shipping back to the us is an issue for a number of reasons as well.but thanks anyway